Gas-lamp.



J. & G. KEITH.

GAS LA P; APPLICATION FILED D20, 19, 191?.

Patented Dec. 2, 1913.

3 SHEBT8-SHBET 1.

I J. & G. KEITH.

Patented Dec. 2, 1913.

3 SHEETS-SHEET 2.

WITN ass 5 QMW RNEY ATTO J & G. KEITH.

GAS LAMP.

APPLIOATION FILED M0119, 1912.

Patented Dec. 2, 1913.

3 SHEETS-SHEET 3.

lnveuToRs JKEiTH S QKEITH TTORNE-Y 30f 'centllamps; h, i-tial-to the successful use of such sil ca globes I while, on account of qdow'nwardpassage 45 vantage. amantle of heretofore '51s serves-asprimaryalr ,To' a'llwhom'z't may wnoem: A I Be it known' that we, JAMES KEITH and GEORGE KEITH, subjectsof the. King of the United Kingdom'of Great Britain and Ireland, and residing at London, England, have-invented a certain new and useful Improvement in Gas-Lamps, of which the fol-- 1 "lowing is a specification. I p

This'invention relates to improvements in --cent gas lamps in which under pressure. 1 a v p,

Suggestions have been made for dlspens- 7 ,ing with secondary airin high pressure in-v vert-ed incandescent gas lamps and thoughome measure of success has been obtained b the use of primary; air alone the highest e cienchas not been reached owing to want 0 knowledgeb'f the-best conditions. We find that when primary air al'oneis used .in high pressure inverted incandescent 1 gas lamps the globe should quite closely surfrdund the mantle. Ordinaryiglass globes present diificulties owing to their liability "fusion andwe therefore form our globes of fused silicathe use of which has been al-' ready suggested as a support or cover for mantlesof ordinarylowpressure incandes-,

None: of the conditions essenhas hithertobeen disclosed; Th'e gas and s air mixture or the air. supply is heated, and .ifth'e mixture led- .3l5 into. a chamber closed or practically closed downwardly under pressure of small dimensions, said chamber being against ingress-of the surrounding atmosgheive to insure exclusion of secondary air.

40tli e1heat inthe neighborhood of the mantle, a-"maximum "lighting efiect is obtained,

' the resistance to the of the flame offered by it'is' possible .to employ with admore open texture than the globe,

In the accompanying, drawings Figure 1 Liis a vertical'section of one ,half o-f a lamp embodying the invention, .Figs. 2 and 3.

50, how. lamps of. similar constriictiom-with al-.

. Q ter'nativ'e. means:

for supporting the v globe; vertical section,

of a modified construction, prbvided v in past a nozzle 1 a'ycool ngcurrent which; 7 gliig. 5,'sh ow s anal ternative-construetiom which the; cooling so-called high pressure. inverted-incandes- 7 air is introduced under pressure or av mixture s ntroduced Specification of ietters Patent.-

this way, on account of concent-ration of 'i 11 means for leadthe globe being,

'. a field oi -temperature destructive of glass:

illustrating a' multiple burnerlamp; Fig. '8

:being of Patented Dem-191a npplication'filedneeeniber19,1911 seriai'n 7s7,e?1. j M

urrent isdischarged with, the products of p combustion into the atmosphere; Figs. J6 and 7 are vertical section and sectionalplan,

is adetail of a construction of lamp in which the mixture is employed to cool the nozzle before entering the heater.

lar parts in the several views.

"As shown, the general construction of the metallic part of the lamp is'si-milar to that described inthe' specification of Letters Patv ,The same reference characters denote siini- I ent No. 917876,'the lamp being fitted with heater a for the gas and air mixture, or

with a heater for the primary air and with .a metallic nozzle of heavy section directly connected to the heater. The mantle 1) into which is led the highly heated self-burning mixture of gas and air is surroimded by a small transparent cylinder'or globe c of a mean diameter which we find from experimental research may vary and one half times to about'thrice the mean diameter of the mantle but which by preference is of the smaller diameter. The cylinderor globe has a closed bottom, excluding secondary air, so' that the mantle is immersed in a very hot atmosphere; the bottom of the'cylinder or globe being spaced from the bottom of the mantle a distance which may approximate the vertical sides ofthe globe and'the verti-' from about one to the distan'ce between cal sides of the-mantle; in other words',.the

'wall of the globe'is spaced from the mantle arounda-nd below the same a distance not exceeding. the mean dlameter in every case, located w shown as ered at its The saidylinder or globe 0 is conoidal form, '2'.- e., tap

of the mantle,

lower end. "The conoidal shape, though not essential, gives the best results.

An arrangement may be provided for heating'the airsnch that cold air is drawn through a j acket 41:, (Z, or each nozzle, of the inj cooling current thus serving ,to keep down the temperature, of the nozzle or nozzles.

and thence. to the inlet v nozzle 01'' of each nozzle an. annular ac ket 3;, connections are led from the dutside, the suction 1 of the chimney may draw "0016 Fig. 5, to which; 1-

sothat- Fig. 4, around the'nozzle ector, as indicated by arrows, the

Alternatively, there may befitted"armmTdthe. upper portion of the .air through these connections, and dis- ,0h81rge it "on to the nozzle and-thence down- I sprung outwardly to engage the inner rim ,ward, as indicated by arrows, whereby the '-;hot products ascending from the cylinder are prevented from concentratingon. the

upper portion of the nozzle (2, the effect of the downwar'd flow of cooler air being to cause the ascending products from the cylinder ctto' spread out in a horizontal direction; or a reflector 2, Figs. 6 and 7, may be pro- .vided witha central aperture 2 through fwhich a. cooling current of air is drawn by the. chimney, the cold air being confined by bafiles a so that it willimpinge on the nozzles; or, as shown in Fig. 8, the mixture may be caused t9 cool the nozzle, being itself heated thereby, the air being drawn into 'the pipe 2 under the action of the gas injector, and so to a. jacket surrounding the V nozzle, thence by: a pipe" connection a to the a heater through which it passes to the interior -oft-henozzle, as indicated by the arrows.

In alamp constructed as above described, owing, to the small amount of clearance between the cylinder'and the side of the man tle, there would ordinarily be a considerable liability of the mantle being damaged by the act of opening or closing the lamp; To ob-. .;v' iate this drawback, we may provide devices guiding the cylinder vertically in such a way asto" prevent damage to the mantle,

such guiding devices being also adapted to act as hangers when the cylinder is lowered,

so that the cylinder need not be touched by the "hand-.-which latter is an important con creates sideration inasmuch as the mere handling of a fused a deposit on the surface of the cylinder, which, when heated, is converted into I tached to a reflector body anopaque body and so obscures thelight. Forexample, in the case shown in Fig. 1, we lead through vertical tubes e fitted to the heater a, two or more vertical rods f atg having a central aperture into which the cylinder 0 .is

. ,fdropped, the outer portion of said reflector body 9 being supported by catches, each of which catches may comprise a flat strip a in hinge-like engagement with a bent portion 7' of a str' secured to the innerportionof the re ector, a spring Z tending to movethe strip z outwardly being provided, and a rivet m or the like passing through the strip is and secured to the strip 21 serving to support the catch, the arrangement being I such that when the outer portion of the re.-

flector is moved upwardly each strip 2' is of the reflect0r,as shown in Fig. 1, which quartz cylinder by the bare fingers Witnesses:

able tightening means, Alternately, as shown inFigl 2, two or more rods o'r wires body of thelamp and be held in raised posi-- tion by engagement with a forked member k adapted to be raised and lowered by rotatiori of a sleeve 1& in screw-threadedengagement with the forked member 7L andabutting at? its lower end against the upper end of. the lamp body so as-to tension the rodsand hold maythen be securedin position'by any suit- 7 6O f -attached to .a reflector body 9 natty-"be fitted toslide through guide holes in the the reflector hard up against the lamp body 79 said forked member/1. being provided with aprong 71, extending downwardly into a holein the lamp body so as to preventrota tion of said member. p y K As shown in Fig. 3 the fitting may be such that the wires f will' be self-tensioned, the

upper ends of the wires being formed as springs in engagement with a stationary forked memberk. WVhat we claim is so, 1. In combination, an inverted highpressure incandescent gas burner, amantlej there v for, and-a globe of fused silica inclosin the mantle and when innse practically closed" against ingress of secondary. air, said globe being located within a field of temperature destructive of glass.-

2. In an inverted" incandescent highpressure gas lamp, "in combination,-an inverted mantle, means for leading a self-burning mixture of gas and air downwardly into'the mantle, a globe ,of translucentrefractory.

to prevent ingress of secondary air, said globe being composed-of highly refractory light transmitting material and located within a field of temperature destructive of In testimony whereof we have signed our names to thisspecification' in the two subscribing witnesses.

JAMES KEITH.

GEORGE KEITH.

presence of WALLACE ORANsToN Famwnarrmn,

JOHN MoOLnAnY.

asto be located within afield 

